Traveling lifting jack



July 7, 1931. G. A. SEXTON TRAVELING LIFTING JACK Filed Sept. 22, 1926 4 Sheets-Sheet, 1

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July 7, 1931. VG. A. SEXTON TRAVELING LIFTING JACK Filed Sept. 22, 1926 4 Sheets-Sheet, 2

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ATTORNEYS.

Patented July 7, 1931 GEORGE A. SEXTON, F BROOKLINE, MASSACHUSETTS TRAVELING LIFTING JACK Application filed September 22, 1926. Serial No. 137,015.

My invention relates to traveling lifting jacks, and its objects are to effect a gradual progressive lift 'of the subject to which it is applied, to afford an effective means for transporting the lifted object, to co-ordinate the lifting and transporting mechanism, and in other ways to reorganize and render more effective the operation of the several parts.

My invention primarily consists in provid- 1 ing the jack with lifting means operated by a toggle connected with a screw and mounted upon and cooperating with a carriage propelled by a chain and sprocket train, all being quickly operableby one person from 15 one end ofthe apparatus.

My invention further consists in the various novel arrangements of parts and modifications hereinafter more particularly described and claimed.

20 Attention is hereby directed to the drawings, in which similar numerals of designation refer to similar parts through the several views: Figure 1 is a side elevation of my improved apparatus; Fig. 2 is an end eleva- 25 tion of my said apparatus; Fig. 3 is an enlarged section on line 3-3 of Fig. 1, looking in the direction of the arrows, showing adjacent parts; Fig. 4 is a View of the table and toggle supporting the same, showing the 30 table in an elevated position; Fig. 5 is a plan View, partlyin section, of my said apparatus; Fig. 6 is an enlarged horizontal section on line 6-6 of Fig. 1, looking in the direction of the arrows and showing a portion of the clutch for throwing in and out of action the propelling mechanism; Fig. 7 is an enlarged section .on line 7 7 of Fig. 2, looking in the direction of the arrows, and Fig. 8 is an enlarged section on line 8-8 of Fig. 1, looking in the direction of the arrows.

Referring to the drawings, the main frame of my apparatus consists of the upright member 9 and a horizontal member form'ed in two parts, the carriage body 10 and the trough or channel 11, all being secured together as shown by means of bolts or screws. The trough or channel 11 extends throughout the apparatus, and is supported, adjacent to the body 10, by the downwardly depending fingers 18 and 19 bolted to the sides of the chanwith the bearings. 17 and 17a, respectively, in which is journalled the axle 20, upon the ends of which are mounted the wheels 21 and 22.

Within the said channel are located the bearings 12 and 13, which are provided with openings registering with the screw 16 and serve to keep the same in proper alignment, and the nuts 14 and 15, each of which is provided with a screw-threaded opening threaded to engage with threaded portions on the screw 16. The nuts 14 and move freely in the trough or channel 11, and are each provided with openings at top portions thereof for the reception of a'bolt, to the ends of which are pivotally secured the lower parts of the arms 23 and 24. These arms 23 and 24 cross each other near their upper extremities, and are rovided with openings at the point of crossing through which passes the bolt vnel. The said fingers 18 and 19 are integral 7 27, thereby forming a toggle joint. Upon the upper ends 25 and 26 of the arms 23 and 24, respectively, rests the table 28, which is secured to the yoke 29, the arms 30 and 31 of which are provided with slots 32 and 33, which engage with the bolt 27 and serve to maintain said table in operative position.

Secured to the inner face of the wheel 21 is the sprocket wheel 34, which is connected with the small sprocket wheel 37 by the sprocket chain mounted upon shaft 38, journalled in bearings of the bracket and block 46, respectively, the bracket 45 being secured to the upright member 9 of the main frame, and the block 46 being secured to the trough or channel 11. Also mounted upon an enlarged portion of the shaft 38, and moving freely thereon is the sprocket wheel 39, the hub of which is provided with a rim 40 engaging with the lower end of the link 41, the upper portion of said link engaging with an arm 42 pivoted at 44 to an extension borne by the upright member of the main frame. The sprocket wheel 39 is provided with a clutch member 43, which engages with a recess in the hub of the small sprocket wheel 37. By swinging the handle 42 on its pivot 44, the lever 41 is caused to swing the clutch member 43 of the sprocket wheel 39 into and out of engagement with the said recess, and thereby to cause the two wheels 37 and 59 to move in unison or to cease such movement. The sprocket wheel 39 is connected by the sprocket chain 56 with the sprocket wheel 57, located at the upper portion 9a of the upright member 9, and operated by the handle 58.

The inner part of the screw 16 passes through an opening in the block 46 adjacent to the upright member 9, and has mounted upon its extreme end the sprocket Wheel 47, which is connected by means of a sprocket chain 48 to a small sprocket wheel 49 mounted upon the hub of the large sprocket wheel 52, the axle of which is journalled in bearings upon the upright member 9. The wheel 52 is connected by means of the chain 53 with the sprocket wheel 54 mounted upon the upper portion 9a of the upright memher 9 of the main frame, and operated by the handle 55. Castors 59 are aflixed to the base of the said upright member 9 and serve to support the head of the apparatus, and attord a means of readily moving the same in any desired direction.

To operate my improved apparatus the table 28 being in a depressed position is moved under the object to'be raised. Then upon turning the crank 55, the sprocket train connected with the said table is operated and the table caused to rise. By reversing said operation the object is lowered to any position desired. If it is desired to move the object, such movement may be accomplished by throwing the clutch 43 intov operative position by means of the handle 42, by turning the handle 58, upon which the sprocket train connected with the axleand the rear wheels 21 and 22 will become 0 )erative and the Wheels caused to revolve thereby moving the carriage. By throwin the clutch in reverse position, and ceasing operate the handle 58, the apparatus will cease to move.

Not only may the carriage be propelled by the manual means abovedescribed. but if desired, mechanism may be installed for effecting such propulsion by other motive means, such, as for example, air, combustion. or electric motor or the like.

While I have herein shown and described the preferred form of my improved apparatus, I by no means desire to limit myself to the exact construction shown, since it is obvious that various changes and modifications might be made without departing from the spirit and purpose of my invention.

lVhat I claim and desire to secure by Letters Patent is:

A lifting jack comprising a carriage body, a trough-like member having one of its end portions connected to said body, an upright member positioned at the other end of said trough-like member, a non-traveling screw rotatively positioned in said last-named member, means borne by said upright member to rotate said screw, 11 pair of spaced blocks threadedly engaging said screw and adapted to be reciprocated and guided by said trough-like member, a table positioned above said carriage body and a pair of arms piv' 

